In the video above for VentureBeat, CrossFit San Francisco Founder and author of Ready to Run Kelly Starrett demonstrates how to type while holding your smartphone.

Get into proper posture by extending your arms to the sides and then rotating your palms upward. This rolls your shoulders back and then you can bend your elbows to type at the keyboard or hold your phone up in front of your face.

When you're sitting, pull in your abs to about 20 per cent of full strength. Sitting should be an active activity, apparently.

Since watching this video, I've been trying this every day, and it feels much better than slouching. No one wants to look like Quasimodo.